Doesn't sound like a shuttle valve problem to me. If it is already moving forward the shuttle valve has moved to it's proper position. I would suspect the problem may be the SR lever is not moving the control valve fully due to wear on quadrant or lever. It needs to pull control valve spool out enough to allow capsules in control valve to ride down the hump and fully seat the balls. I would just try forcing the SR lever fully to the side when advancing it and see if you skip past the problem area. If so, then you need to do an adjustment on valve linkage or repair worn areas.
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